Presumably because he wants to be able to dial out for emergencies, and to call people who don't use instant messaging or email (e.g., local businesses, or <shu

Presumably because he wants to be able to dial out for emergencies, and to call people who don't use instant messaging or email (e.g., local businesses, or <shudder> taxi dispatch). Plus there's the fact that many official forms require a phone number of some sort, and it seems less evil to provide a number you own but don't answer than a random one.